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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: QueryVersionFunction.html 671 2015-01-17 15:50:55Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse.func;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.jsimpledb.JTransaction;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.jsimpledb.core.CoreIndex;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.jsimpledb.core.ObjId;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.jsimpledb.core.ObjType;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.kv.KeyRanges;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.jsimpledb.parse.ObjTypeParser;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.parse.ParseContext;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.jsimpledb.parse.ParseException;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.jsimpledb.parse.ParseSession;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.parse.expr.AbstractValue;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.jsimpledb.parse.expr.Node;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.jsimpledb.parse.expr.Value;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>@Function<a name="line.23"></a>
<span class="sourceLineNo">024</span>public class QueryVersionFunction extends AbstractFunction {<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>    public QueryVersionFunction() {<a name="line.26"></a>
<span class="sourceLineNo">027</span>        super("queryVersion");<a name="line.27"></a>
<span class="sourceLineNo">028</span>    }<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    @Override<a name="line.30"></a>
<span class="sourceLineNo">031</span>    public String getHelpSummary() {<a name="line.31"></a>
<span class="sourceLineNo">032</span>        return "queries the object version index";<a name="line.32"></a>
<span class="sourceLineNo">033</span>    }<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>    @Override<a name="line.35"></a>
<span class="sourceLineNo">036</span>    public String getUsage() {<a name="line.36"></a>
<span class="sourceLineNo">037</span>        return "queryVersion([object-type])";<a name="line.37"></a>
<span class="sourceLineNo">038</span>    }<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>    @Override<a name="line.40"></a>
<span class="sourceLineNo">041</span>    public String getHelpDetail() {<a name="line.41"></a>
<span class="sourceLineNo">042</span>        return "Queries the index of object versions, returning a map from object version to the set of objects with that version."<a name="line.42"></a>
<span class="sourceLineNo">043</span>          + " An optional object type restricts returned objects.";<a name="line.43"></a>
<span class="sourceLineNo">044</span>    }<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>    // Returns either null, ObjType, or Node<a name="line.46"></a>
<span class="sourceLineNo">047</span>    @Override<a name="line.47"></a>
<span class="sourceLineNo">048</span>    public Object parseParams(final ParseSession session, final ParseContext ctx, final boolean complete) {<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>        // Check existence of parameter<a name="line.50"></a>
<span class="sourceLineNo">051</span>        if (ctx.tryLiteral(")"))<a name="line.51"></a>
<span class="sourceLineNo">052</span>            return null;<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>        // Attempt to parse either type name or Java expression (hopefully evaluating to Class&lt;?&gt;)<a name="line.54"></a>
<span class="sourceLineNo">055</span>        Object result;<a name="line.55"></a>
<span class="sourceLineNo">056</span>        final int typeStart = ctx.getIndex();<a name="line.56"></a>
<span class="sourceLineNo">057</span>        try {<a name="line.57"></a>
<span class="sourceLineNo">058</span>            result = new ObjTypeParser().parse(session, ctx, complete);<a name="line.58"></a>
<span class="sourceLineNo">059</span>            ctx.skipWhitespace();<a name="line.59"></a>
<span class="sourceLineNo">060</span>            if (!ctx.tryLiteral(")"))<a name="line.60"></a>
<span class="sourceLineNo">061</span>                throw new ParseException(ctx);<a name="line.61"></a>
<span class="sourceLineNo">062</span>        } catch (ParseException e) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>            ctx.setIndex(typeStart);<a name="line.63"></a>
<span class="sourceLineNo">064</span>            result = this.parseExpressionParams(session, ctx, complete, 0, 1, 1)[0];<a name="line.64"></a>
<span class="sourceLineNo">065</span>        }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>        // Done<a name="line.67"></a>
<span class="sourceLineNo">068</span>        return result;<a name="line.68"></a>
<span class="sourceLineNo">069</span>    }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>    @Override<a name="line.71"></a>
<span class="sourceLineNo">072</span>    public Value apply(ParseSession session, final Object param) {<a name="line.72"></a>
<span class="sourceLineNo">073</span>        return new AbstractValue() {<a name="line.73"></a>
<span class="sourceLineNo">074</span>            @Override<a name="line.74"></a>
<span class="sourceLineNo">075</span>            public Object get(ParseSession session) {<a name="line.75"></a>
<span class="sourceLineNo">076</span>                if (session.hasJSimpleDB()) {<a name="line.76"></a>
<span class="sourceLineNo">077</span>                    final Class&lt;?&gt; type =<a name="line.77"></a>
<span class="sourceLineNo">078</span>                      param instanceof ObjType ?<a name="line.78"></a>
<span class="sourceLineNo">079</span>                        session.getJSimpleDB().getJClass(((ObjType)param).getStorageId()).getType() :<a name="line.79"></a>
<span class="sourceLineNo">080</span>                      param instanceof Node ?<a name="line.80"></a>
<span class="sourceLineNo">081</span>                        ((Node)param).evaluate(session).checkType(session, QueryVersionFunction.this.getName(), Class.class) :<a name="line.81"></a>
<span class="sourceLineNo">082</span>                        Object.class;<a name="line.82"></a>
<span class="sourceLineNo">083</span>                    return JTransaction.getCurrent().queryVersion(type);<a name="line.83"></a>
<span class="sourceLineNo">084</span>                } else {<a name="line.84"></a>
<span class="sourceLineNo">085</span>                    CoreIndex&lt;Integer, ObjId&gt; index = session.getTransaction().queryVersion();<a name="line.85"></a>
<span class="sourceLineNo">086</span>                    final int storageId =<a name="line.86"></a>
<span class="sourceLineNo">087</span>                      param instanceof Node ?<a name="line.87"></a>
<span class="sourceLineNo">088</span>                        ((Node)param).evaluate(session).checkType(session, QueryVersionFunction.this.getName(), Integer.class) :<a name="line.88"></a>
<span class="sourceLineNo">089</span>                      param instanceof ObjType ?<a name="line.89"></a>
<span class="sourceLineNo">090</span>                        ((ObjType)param).getStorageId() :<a name="line.90"></a>
<span class="sourceLineNo">091</span>                        -1;<a name="line.91"></a>
<span class="sourceLineNo">092</span>                    if (storageId != -1)<a name="line.92"></a>
<span class="sourceLineNo">093</span>                        index = index.filter(1, new KeyRanges(ObjId.getKeyRange(storageId)));<a name="line.93"></a>
<span class="sourceLineNo">094</span>                    return index.asMap();<a name="line.94"></a>
<span class="sourceLineNo">095</span>                }<a name="line.95"></a>
<span class="sourceLineNo">096</span>            }<a name="line.96"></a>
<span class="sourceLineNo">097</span>        };<a name="line.97"></a>
<span class="sourceLineNo">098</span>    }<a name="line.98"></a>
<span class="sourceLineNo">099</span>}<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>




























































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